---
product_id: 1710197
title: "K9 Advantix II XL Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs Over 55 lbs. | 6-Mo Supply"
brand: "k9 advantix"
price: "A$180"
currency: AUD
in_stock: true
reviews_count: 6
category: "K9 Advantix"
url: https://www.desertcart.com.au/products/1710197-k9-advantix-ii-xl-dog-vet-recommended-flea-tick-mosquito
store_origin: AU
region: Australia
---

# For dogs 55+ lbs Waterproof after 24 hours Kills fleas in 12 hours K9 Advantix II XL Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs Over 55 lbs. | 6-Mo Supply

**Brand:** k9 advantix
**Price:** A$180
**Availability:** ✅ In Stock

## Summary

> 🐾 Protect your big buddy from pests before they even bite!

## Quick Answers

- **What is this?** K9 Advantix II XL Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs Over 55 lbs. | 6-Mo Supply by k9 advantix
- **How much does it cost?** A$180 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/1710197-k9-advantix-ii-xl-dog-vet-recommended-flea-tick-mosquito)

## Best For

- k9 advantix enthusiasts

## Why This Product

- Trusted k9 advantix brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Multi-Pest Defense:** Repels and kills fleas, ticks, mosquitoes, biting flies & lice on contact
- • **Rapid Flea Elimination:** Kills fleas within 12 hours to stop infestations fast
- • **Easy, Fragrance-Free Application:** Topical spot-on treatment that’s quick, mess-free, and scentless
- • **Long-Lasting Waterproof Protection:** Waterproof formula keeps working even after a swim or rain
- • **Vet-Recommended & Prescription-Free:** Trusted by vets and available OTC for hassle-free care

## Overview

K9 Advantix II XL is a vet-recommended, topical flea, tick, mosquito, biting fly, and lice treatment designed for dogs over 55 lbs. It kills fleas within 12 hours and repels pests on contact, preventing bites and disease transmission. The waterproof, fragrance-free formula is easy to apply monthly without a prescription, ensuring your dog stays protected indoors and outdoors all season long.

## Description

K9 Advantix II Extra Large Dog is the veterinarian-recommended formula that helps defend your dog against five pests: fleas, ticks, mosquitoes, biting flies and lice. And unlike other treatments, K9 Advantix II kills and repels fleas, ticks and mosquitoes. K9 Advantix II topical treatment gets straight to work killing fleas on dogs within 12 hours of initial application. This formula stops existing flea infestations and prevents new ones by killing adult fleas on contact so they can’t lay eggs and they don’t have to bite your dog to die. Fleas, ticks, mosquitoes and other pests not only cause discomfort; they may also transmit disease. Monthly use of K9 Advantix II is important to protect your dog against fleas that may cause transmission of tapeworms. This formula also kills fleas which may cause Flea Allergy Dermatitis and flea bite anemia. That’s why K9 Advantix II Extra Large Dog topical, spot-on formula makes application simple - going on in seconds. It's easier than a flea collar and there are no hard-to-swallow pills. You’ll also love that K9 Advantix II is fragrance-free and waterproof after 24 hours of application. Check the product label for information on application and potential side effects. K9 Advantix II pest protection is effective on both indoor and outdoor dogs. Your dog should be at least 7 weeks old and weigh over 55 lbs. to use K9 Advantix II Extra Large Dog. For the ultimate convenience in care, K9 Advantix II is available over the counter – no prescription needed. And, you can stock up with 2-dose, 4-dose and 6-dose packs so you never miss a monthly treatment. Once K9 Advantix II is applied, your dog is ready to get right back to big-pup cuddles and racing around the park. K9 Advantix II Extra Large Dog is a trademark of Elanco or its affiliates.

Review: Works great awesome I definitely suggested - UPDATE I don’t know what y’all all your people take your dogs to the vets instead of showing them online here that they can’t walk. The fur is falling out of the bleeding. That’s ridiculous. Take your dog to the friggin neck. Let the vet determine the cause exactly and then if it’s in clause because of this then Put a negative and state the fact that you took him to a vet and the vet did test and it was the closet because I’ve been using this product for 25 years on my dogs back then and my new dogs now my dogs I had 16 years ago dogs I had 10 years ago dogs I had 13 years ago my 16 1/2 year old cocker spaniel has had this from the day he could actually have this And I have never had a problem with that on any of my dogs especially him you know it got rid of the fleas and I noticed a few texts very easy to get off compared when I didn’t use it like if I skipped a couple of months and they had a dick and I was like oh my God and then I would try to get it off and it was a hassle. I mean, it did not pull up. Come out whatever And so I put them back on this every month originally and if they get a tick and I see it. I just need tweezers and it just pops right off no eggs inside nothing no problem with the weather did not cause any of my dogs ever itch or lose hair so I think you people have an undergoing problem with your dog that you did not address Prior to use this. Yes, I’m gonna blame you. Yes I’m blaming all you that people that has undermining problems with their dog and you don’t take them to the vet and you add this product on top of them. Yes, it probably will do something like that. SO I REPEAT, TAKE YOUR DOG TO THE GD VETERINARIAN PROFESSIONAL LET THE PROFESSIONAL DO THEIR WORK !!!! Oh, I also have one dog right now. I have three of them English mastiff and I have one of them that sits at my back gate in the dirt never has fleas never has sticks never has any. He lays in the dirt 185 pound and his head I can look it out right now his head is in it. His whole body lengthwise is in it and I swear he digs holes just you know it makes it cool.. and there’s a picture of him laying at the fence in the dirt. He loves it. I check them every day. Nobody has fleas. Nobody has anything so you people are doing something wrong. I’m gonna blame all of you. They have a problem and I’ll say it again again again they have underlining problem TAKE THEM TO THE VET VETERINARIAN HAVE THE VET, VETERINARIAN, TECHNICIAN, AND DOCTOR EXAMINE THE DOG TAKE SKIN GRAPHS WHATEVER THE BEST HAS TO DO. DON’T BLAME THE PRODUCT UNLESS YOU DID THAT AND IF YOU DID IT AND THEN DOCTOR RUNS TEXT AND SAID YES, IT WAS CAUSED BY THAT PRODUCT. WELL HENCE THERE YOU GO AND IT’S THE PRODUCT FAULT BUT A 99.999% IT’S NOT THE PRODUCT. Started having dogs when we first got married we have we had seven English mastiffs yeah it’s addicting and they had puppies and everything so anyways I’ve been using this on my dogs from year 2000 and I use them before that on my other dog so I’ve always used it really and I love it. I mean, I swear by it this stuff is great. My dogs do not get flea or I mean I have to put a spray on them to detail the mosquitoes, but don’t see my bugs biting them. It’s pricey, but it’s worth it. You don’t wanna have your dogs get Lyme disease or you know from ticks, I really suggest this. No bother my dog knock on wood you know in the other thing is I don’t use this year around. I only use it from spring until after fall. I don’t feel I really needed in the winter time. It’s too cold outside for anything to live so I’m up Northeast And I don’t seem to have any problem and they’re not using it as soon as spring hits that’s that boom they’re on it.
Review: The safest and most effective tick protection - ticks fall off just from touching the fur - I brought my dog to West Virginia, and thank God for Advantix II — because I’ve been finding half-dead ticks every single day (no joke) in places where she sleeps or rests. At first, I was confused. I thought "repels ticks" meant it would work like bug spray does for mosquitoes, keeping them away completely. But after looking into the active ingredient, permethrin, I realized that in this case, “repel” means: once a tick touches the treated fur, it becomes so irritated or neurologically impaired that it can’t bite, can’t hang on, and eventually just falls off and dies. That’s still so much better than PetArmor, Frontline, or any of the oral preventatives (like Simparica or NexGard), which require the tick to bite the dog before it dies. No thanks. Every tick I’ve found so far had already dropped off my dog before it had a chance to bite her and feed — exactly what you want in a tick-heavy area. I’ve also tried Wondercide (cedar oil). It works okay for fleas, but it’s just not effective for ticks, especially not in the long term. Its protection wears off after 2–4 hours. I learned the hard way — my dog caught Lyme disease, developed joint pain and a limp. Thankfully, doxycycline helped and she’s okay now, but it required a full 28-day antibiotic course. I would never use oral flea/tick medications. Just ask around — you’ll hear plenty of stories about dogs having seizures after taking them. For me, that risk isn’t worth it. If you have a cat at home, unfortunately Advantix II may not be right for your household — permethrin is toxic to cats (especially when wet). But if you don’t have cats, I highly recommend this product to all dog owners. Tick-borne diseases are no joke. Fleas are annoying — I’ve had to go through the nightmare of clearing an infestation — but at least they just suck blood without causing life-threatening illness. Ticks, on the other hand, can transmit Lyme, Ehrlichia, Rocky Mountain spotted fever, and more. So if you live somewhere warm, humid, grassy, or deer-heavy — do your dog a favor and get Advantix II. It’s been a lifesaver for us.

## Features

- K9 Advantix II Extra Large Dog 30-day treatment & prevention protects dogs over 55 lbs. from fleas, ticks, mosquitoes, biting flies and lice
- Kills fleas within 12 hours of application
- Vet-recommended formula kills & repels on contact so fleas don’t have to bite your dog to die
- Easy-to-apply topical treatment is fragrance-free and waterproof after 24 hours
- No prescription needed

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004QRJJ0K |
| ASIN  | B004QRJJ0K |
| Age Range Description | 7 weeks and older |
| Best Sellers Rank | #411 in Pet Supplies ( See Top 100 in Pet Supplies ) #3 in Dog Flea Drops |
| Brand Name | K9 Advantix |
| Breed Recommendation | Extra Large |
| Color | Extra-Large Dog only |
| Country of Origin | Germany |
| Customer Reviews | 4.4 4.4 out of 5 stars (48,071) |
| Date First Available | March 20, 2007 |
| Date First Available  | March 20, 2007 |
| Department | Flea & Tick |
| Department  | Flea & Tick |
| Directions | Application Instructions: 1. Use only on dogs. DO NOT USE ON CATS or other animals. 2. The dog should be standing for easy application. Evenly apply the entire contents of the K9 Advantix® II tube to four to six spots on the top of the back from the shoulder to the base of the tail. 3. At each spot, part the hair until the skin is visible. 4. Place the tip of the tube on the skin and gently squeez… |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 7.75 x 1 x 4.25 inches |
| Item Package Dimensions L x W x H | 6.65 x 4.41 x 1.38 inches |
| Item Weight | 1.6 ounces |
| Item model number | 81520429 |
| Item model number  | 81520429 |
| Manufacturer | Elanco US Inc |
| Manufacturer  | Elanco US Inc |
| Manufacturer recommended age  | 1 month and up |
| Model Name | K9 Advantix II |
| Number of Items | 6 |
| Product Dimensions  | 7.75 x 1 x 4.25 inches; 1.6 ounces |
| Size | 6 Pack |
| Specific Uses for Product | Parasites |
| Style | XL Dog only |
| Target Audience Keyword | dogs |

## Product Details

- **Active Ingredients:** Imidacloprid, Permethrin, Pyriproxyfen
- **Age Range (Description):** 7 weeks and older
- **Allergen Information:** Allergen-Free
- **Brand:** K9 Advantix
- **Global Trade Identification Number:** 00724089204295
- **Item Form:** Topical
- **Item Volume:** 24 Milliliters
- **Item Weight:** 1.6 ounces
- **Scent:** Unscented
- **UPC:** 024089616501 724089204295

## Images

![K9 Advantix II XL Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs Over 55 lbs. | 6-Mo Supply - Image 1](https://m.media-amazon.com/images/I/71-Ak1Anf+L.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Has anyone switched over from Frontline Plus to K9 Advantix II and is happy? For Dogs**
A: YES!!!!  I've had the same experience with my dogs as Nicole A replied.  I had been pleased with Frontline for years....but in 2012 (and ever since) it has just stopped working.  One of my dogs is a fur-making machine: and fleas don't seem to bother him...even if I am finding them on him.  The other dog has horrible flea allergies:  has immediate, sustained, and severe "hot spots" after even just ONE flea bite...skin will turn pink all over his body...and he "blows" large amounts of his beautiful, lush, scruffy coat...and he just doesn't seem to be his usual happy, bright, and enthusiastic self :-(   Using Advantix II....he seems to not have problems at all (it keeps the fleas from breeding...although if one occasional transient flea bites him....it will die...but the dog will still get a "hotspot", but nowhere as intense or sustained as without Advantix II...and if I find it quickly and clean it with vinegar, he may not even need a dose of benedryl).  During the "flea season" since using Advantix II he has been able to keep his lush coat with no problems.....to such an extent that I brought him in to my vet's office just to show the vet how well he was doing one summer (the dog had been so bad the previous summer while using Frontline that I had to take him to the vet for skin reactions, fur loss in large areas of his coat, and a secondary infection from scratching...I had been so discouraged about the flea problems that year while on Frontline that I had been taking the dog daily to the lake so he could swim and drown the damned fleas).  The vet was very pleased with the dog's condition with Advantix II, and had stated he has learned from his patients that they are also seeing less effectiveness with Frontline in recent years.  I won't use anything else but Advantix II during this up-coming flea season.  (although I do also spray his coat/skin with vinegar (mixed 1/2 with water) each day as a flea deterrent...especially if he gets a hotspot...and I add a small amount of vinegar to his food as well........and when he does need a bath:  I use EXTREMELY diluted Dr. Bronner's castile liquid soap in the "EUCALYPTUS" version....the dog tolerates it well...and it seems the scent repels fleas a bit.   I use the soap as well to launder the cover of his dog bed at least weekly).   I know that insects can get resistent to certain pesticides over time....and I suspect that is why Frontline no longer works in our area.....I sure hope it doesn't eventually happen with Advantix II as well....and I hope that producers of flea/tick products for dogs will monitor this situation and re-formulate their products as needed to address the situation--regionally if need be.

**Q: I thought I was ordering Advantage II but by mistake, ordered Advantix II.  What is the difference, and does it work the same?**
A: You can’t use advantix on cats.  sadly because advantix 2 is superior and is the best out there because unlike advantage (and unlike frontline) it repels flies and mosquitoes as well as ticks and fleas.  but it is toxic to cats.  as cats should be indoors only you shouldn’t need tick/mosquito repellent just flea.  DO NOT USE ADVANTIX ON CATS!  It is toxic to them

**Q: What about cats? I used to use Advantix on my cats with no problems, as suggested by my vet to save money. Has the formula changed?**
A: Look at the active ingredients for both the dog & cat formulas; They are exactly the same. Only difference is the dosage size which you can easily look up on the internet & save yourself a ton of money

**Q: Could I use this along with a flea/tick collar?**
A: As a vet tech we say a flea collar is basically worthless..At most may keep fleas off pets head. If you can buy flea collar at store probably won’t work and even the script only work minimal. Stick to topical like frontline plus, advantage, advantix and oral like Capstar. Flea collars are most always a waste of $. To remove fleas fast simply bathe dog and let dog sit in water…drowning fleas and follow up in few hours with topical if bad infestation. Just a flea or 2 I’d still bathe but topical probably enough. All topicals are water resistant after 24hr

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great awesome I definitely suggested
*by A***E on July 3, 2025*

UPDATE I don’t know what y’all all your people take your dogs to the vets instead of showing them online here that they can’t walk. The fur is falling out of the bleeding. That’s ridiculous. Take your dog to the friggin neck. Let the vet determine the cause exactly and then if it’s in clause because of this then Put a negative and state the fact that you took him to a vet and the vet did test and it was the closet because I’ve been using this product for 25 years on my dogs back then and my new dogs now my dogs I had 16 years ago dogs I had 10 years ago dogs I had 13 years ago my 16 1/2 year old cocker spaniel has had this from the day he could actually have this And I have never had a problem with that on any of my dogs especially him you know it got rid of the fleas and I noticed a few texts very easy to get off compared when I didn’t use it like if I skipped a couple of months and they had a dick and I was like oh my God and then I would try to get it off and it was a hassle. I mean, it did not pull up. Come out whatever And so I put them back on this every month originally and if they get a tick and I see it. I just need tweezers and it just pops right off no eggs inside nothing no problem with the weather did not cause any of my dogs ever itch or lose hair so I think you people have an undergoing problem with your dog that you did not address Prior to use this. Yes, I’m gonna blame you. Yes I’m blaming all you that people that has undermining problems with their dog and you don’t take them to the vet and you add this product on top of them. Yes, it probably will do something like that. SO I REPEAT, TAKE YOUR DOG TO THE GD VETERINARIAN PROFESSIONAL LET THE PROFESSIONAL DO THEIR WORK !!!! Oh, I also have one dog right now. I have three of them English mastiff and I have one of them that sits at my back gate in the dirt never has fleas never has sticks never has any. He lays in the dirt 185 pound and his head I can look it out right now his head is in it. His whole body lengthwise is in it and I swear he digs holes just you know it makes it cool.. and there’s a picture of him laying at the fence in the dirt. He loves it. I check them every day. Nobody has fleas. Nobody has anything so you people are doing something wrong. I’m gonna blame all of you. They have a problem and I’ll say it again again again they have underlining problem TAKE THEM TO THE VET VETERINARIAN HAVE THE VET, VETERINARIAN, TECHNICIAN, AND DOCTOR EXAMINE THE DOG TAKE SKIN GRAPHS WHATEVER THE BEST HAS TO DO. DON’T BLAME THE PRODUCT UNLESS YOU DID THAT AND IF YOU DID IT AND THEN DOCTOR RUNS TEXT AND SAID YES, IT WAS CAUSED BY THAT PRODUCT. WELL HENCE THERE YOU GO AND IT’S THE PRODUCT FAULT BUT A 99.999% IT’S NOT THE PRODUCT. Started having dogs when we first got married we have we had seven English mastiffs yeah it’s addicting and they had puppies and everything so anyways I’ve been using this on my dogs from year 2000 and I use them before that on my other dog so I’ve always used it really and I love it. I mean, I swear by it this stuff is great. My dogs do not get flea or I mean I have to put a spray on them to detail the mosquitoes, but don’t see my bugs biting them. It’s pricey, but it’s worth it. You don’t wanna have your dogs get Lyme disease or you know from ticks, I really suggest this. No bother my dog knock on wood you know in the other thing is I don’t use this year around. I only use it from spring until after fall. I don’t feel I really needed in the winter time. It’s too cold outside for anything to live so I’m up Northeast And I don’t seem to have any problem and they’re not using it as soon as spring hits that’s that boom they’re on it.

### ⭐⭐⭐⭐⭐ The safest and most effective tick protection - ticks fall off just from touching the fur
*by Y***N on June 4, 2025*

I brought my dog to West Virginia, and thank God for Advantix II — because I’ve been finding half-dead ticks every single day (no joke) in places where she sleeps or rests. At first, I was confused. I thought "repels ticks" meant it would work like bug spray does for mosquitoes, keeping them away completely. But after looking into the active ingredient, permethrin, I realized that in this case, “repel” means: once a tick touches the treated fur, it becomes so irritated or neurologically impaired that it can’t bite, can’t hang on, and eventually just falls off and dies. That’s still so much better than PetArmor, Frontline, or any of the oral preventatives (like Simparica or NexGard), which require the tick to bite the dog before it dies. No thanks. Every tick I’ve found so far had already dropped off my dog before it had a chance to bite her and feed — exactly what you want in a tick-heavy area. I’ve also tried Wondercide (cedar oil). It works okay for fleas, but it’s just not effective for ticks, especially not in the long term. Its protection wears off after 2–4 hours. I learned the hard way — my dog caught Lyme disease, developed joint pain and a limp. Thankfully, doxycycline helped and she’s okay now, but it required a full 28-day antibiotic course. I would never use oral flea/tick medications. Just ask around — you’ll hear plenty of stories about dogs having seizures after taking them. For me, that risk isn’t worth it. If you have a cat at home, unfortunately Advantix II may not be right for your household — permethrin is toxic to cats (especially when wet). But if you don’t have cats, I highly recommend this product to all dog owners. Tick-borne diseases are no joke. Fleas are annoying — I’ve had to go through the nightmare of clearing an infestation — but at least they just suck blood without causing life-threatening illness. Ticks, on the other hand, can transmit Lyme, Ehrlichia, Rocky Mountain spotted fever, and more. So if you live somewhere warm, humid, grassy, or deer-heavy — do your dog a favor and get Advantix II. It’s been a lifesaver for us.

### ⭐⭐⭐⭐⭐ Topical Parasite protection K9 Advantage ll
*by W***R on February 1, 2026*

Thank you for this really good product. K9 Advantage ll is vet recommended for topical use on large dog. I say yes.

## Frequently Bought Together

- K9 Advantix II XL Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs Over 55 lbs. | 6-Mo Supply
- K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21 - 55 lbs. | 6-Mo Supply
- Advantage II Large Cat Vet-Recommended Flea Treatment & Prevention | Cats Over 9 lbs. | 6-Month Supply

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-03*